php - Why does mkdir mode parameter start with 0? -


mkdir function has default value parameter mode 0777. 

bool mkdir ( string $pathname [, int $mode = 0777 [, bool $recursive = false [, resource $context ]]] )

every example of mkdir have seen, has mode parameter starting 0. doesn't leading octal digit signify type of file?

from this page, 0 means regular file while 3 means directory.

so, shouldn't default value mode parameter in mkdir 3777 opposed 0777.

what difference between 2 modes respect mkdir. if creating regular folder, mode value should use?

you can pretty confusing information depending on whom ask. modes specify chmod, mkdir, touch , other tools create , modify file permissions tend deal lower-order permission bits, , sticky , set[ug]id bits. higher-order parts of mode, ls -l , stat output, less seen, include file type.

the rightmost 9 bits entirely occupied permissions, , next several bits related sticky, setuid , segid bits. note:

bin(0777)  =>    '0b111111111' # 9 bits, read, write, exec bin(01777) =>   '0b1111111111' # 10 bits, sticky + 0777 bin(02777) =>  '0b10111111111' # 11 bits, setgid + 0777 bin(04777) => '0b100111111111' # 12 bits, setuid + 0777

so article little confusing considering there's no space file type fit within first 12 bits.

you seem clear on in question, posterity, leading 0 identifies value octal. if wanted specify file type, you'd have start 03….

in case, mkdir going make directory or nothing. won't make file, it's not concerned file type bit.


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